You have a twenty - twenty vision.

你的视力很正常.

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I have twenty - twenty vision.

我的视力正常.

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I think RMA is at least thirty years from now . May be twenty, twenty - five , twenty - three.

至少还需要30年,也可能20 、 25或23年.

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I am a twenty - twenty student But many of classmates are near - sighted.

我班的许多同学都得了近视,可我的视力却很正常.

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